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Toughening Effect and Oxidation Behavior of MoSi2-ZrO2 Composites

Karin Gong (Institutionen för material- och tillverkningsteknik) ; Changhai Li (Institutionen för material- och tillverkningsteknik) ; Yiming Yao (Institutionen för material- och tillverkningsteknik, Materialteknologi)
Materials Research Society Symposium Proceedings MRS (0980-II05-35). Vol. 980 (2007), p. 339-344.
[Artikel, refereegranskad vetenskaplig]

Toughening effect of ZrO2-particles on MoSi2-based materials is one of the important toughening mechanisms. In this work, the influence of particle size and volume percentage of unstabilized ZrO2-addition on toughening in MoSi2-matrix composites was studied. The measured data revealed that the fine particle size, < 1 μm, with certain volume percentages around 20% have given more effective toughening results. The tested materials were prepared by two different sintering processes: pressure-less sintering (PLS) and PLS + Hipping sintering. The results on sintered density, RT-hardness and RT-toughness indicated that the PLS process could be a practical and economical method for producing MOSi2-ZrO2 composites in industry. Oxidation behavior of MoSi2-ZrO2 composites was also studied in the work. Clearly, the ZrO2-addition made the composites having a worse oxidation resistance than the monolithic MoSi2, which means that a low ZrO2-addition should be used in the composites, as far as an acceptable toughening effect was reached.

Nyckelord: Intermetallic, Toughness, MoSi2,Oxidation



Denna post skapades 2007-11-05. Senast ändrad 2015-11-05.
CPL Pubid: 61056